etisserant@0: /*
etisserant@0:  * (c) 2003 Mario de Sousa
etisserant@0:  *
etisserant@0:  * Offered to the public under the terms of the GNU General Public License
etisserant@0:  * as published by the Free Software Foundation; either version 2 of the
etisserant@0:  * License, or (at your option) any later version.
etisserant@0:  *
etisserant@0:  * This program is distributed in the hope that it will be useful, but
etisserant@0:  * WITHOUT ANY WARRANTY; without even the implied warranty of
etisserant@0:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
etisserant@0:  * Public License for more details.
etisserant@0:  *
etisserant@0:  * This code is made available on the understanding that it will not be
etisserant@0:  * used in safety-critical situations without a full and competent review.
etisserant@0:  */
etisserant@0: 
etisserant@0: /*
etisserant@0:  * An IEC 61131-3 IL and ST compiler.
etisserant@0:  *
etisserant@0:  * Based on the
etisserant@0:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
etisserant@0:  *
etisserant@0:  */
etisserant@0: 
etisserant@0: 
etisserant@0: /* Determine the data type on which another data type is based on.
etisserant@0:  * If a new default initial value is given, we DO NOT consider it a
etisserant@0:  * new base class, and continue looking further!
etisserant@0:  *
etisserant@0:  * E.g. TYPE new_int_t : INT; END_TYPE;
etisserant@0:  *      TYPE new_int2_t : INT = 2; END_TYPE;
etisserant@0:  *      TYPE new_subr_t : INT (4..5); END_TYPE;
etisserant@0:  *
etisserant@0:  *    new_int_t is really an INT!!
etisserant@0:  *    new_int2_t is also really an INT!!
etisserant@0:  *    new_subr_t is also really an INT!!
etisserant@0:  */
etisserant@0: class search_base_type_c: public null_visitor_c {
etisserant@0:   private:
etisserant@0:     symbol_c *current_type_name;
etisserant@0: 
etisserant@0:   public:
etisserant@0:     search_base_type_c(void) {current_type_name = NULL;}
etisserant@0: 
etisserant@0:   public:
etisserant@0:     void *visit(identifier_c *type_name) {
etisserant@0:       this->current_type_name = type_name;
etisserant@0:       /* look up the type declaration... */
etisserant@0:       symbol_c *type_decl = type_symtable.find_value(type_name);
etisserant@0:       if (type_decl == type_symtable.end_value())
etisserant@0:         /* Type declaration not found!! */
etisserant@0: 	ERROR;
etisserant@0: 
etisserant@0:       return type_decl->accept(*this);
etisserant@0:     }
etisserant@0: 
etisserant@0: /***********************************/
etisserant@0: /* B 1.3.1 - Elementary Data Types */
etisserant@0: /***********************************/
etisserant@0:     void *visit(time_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(bool_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(sint_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(int_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(dint_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(lint_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(usint_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(uint_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(udint_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(ulint_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(real_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(lreal_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(date_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(tod_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(dt_type_name_c *symbol)		{return (void *)symbol;}
etisserant@0:     void *visit(byte_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(word_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(dword_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(lword_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(string_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0:     void *visit(wstring_type_name_c *symbol)	{return (void *)symbol;}
etisserant@0: 
etisserant@0: /********************************/
etisserant@0: /* B 1.3.3 - Derived data types */
etisserant@0: /********************************/
etisserant@0: /*  simple_type_name ':' simple_spec_init */
etisserant@0:     void *visit(simple_type_declaration_c *symbol) {
etisserant@0:       return symbol->simple_spec_init->accept(*this);
etisserant@0:     }
etisserant@0: /* simple_specification ASSIGN constant */
etisserant@0:     void *visit(simple_spec_init_c *symbol) {
etisserant@0:       return symbol->simple_specification->accept(*this);
etisserant@0:     }
etisserant@0: 
etisserant@0: /*  subrange_type_name ':' subrange_spec_init */
etisserant@0:     void *visit(subrange_type_declaration_c *symbol) {
etisserant@0:       return symbol->subrange_spec_init->accept(*this);
etisserant@0:     }
etisserant@0: 
etisserant@0: /* subrange_specification ASSIGN signed_integer */
etisserant@0:     void *visit(subrange_spec_init_c *symbol) {
etisserant@0:       return symbol->subrange_specification->accept(*this);
etisserant@0:     }
etisserant@0: 
etisserant@0: /*  integer_type_name '(' subrange')' */
etisserant@0:     void *visit(subrange_specification_c *symbol) {
etisserant@0:       return symbol->integer_type_name->accept(*this);
etisserant@0:     }
etisserant@0: 
etisserant@0: /*  signed_integer DOTDOT signed_integer */
etisserant@0:     void *visit(subrange_c *symbol) {ERROR; return NULL;} /* should never get called... */
etisserant@0: 
etisserant@0: /*  enumerated_type_name ':' enumerated_spec_init */
etisserant@0:     void *visit(enumerated_type_declaration_c *symbol) {
etisserant@0:       this->current_type_name = symbol->enumerated_type_name;
etisserant@0:       return symbol->enumerated_spec_init->accept(*this);
etisserant@0:     }
etisserant@0: 
etisserant@0: /* enumerated_specification ASSIGN enumerated_value */
etisserant@0:     void *visit(enumerated_spec_init_c *symbol) {
etisserant@0:       return symbol->enumerated_specification->accept(*this);
etisserant@0:     }
etisserant@0: 
etisserant@0: /* helper symbol for enumerated_specification->enumerated_spec_init */
etisserant@0: /* enumerated_value_list ',' enumerated_value */
etisserant@0:     void *visit(enumerated_value_list_c *symbol) {
etisserant@0:       if (NULL == this->current_type_name) ERROR;
etisserant@0:       return (void *)this->current_type_name;
etisserant@0:     }
etisserant@0: 
etisserant@0: /* enumerated_type_name '#' identifier */
etisserant@0: // SYM_REF2(enumerated_value_c, type, value)
etisserant@0:     void *visit(enumerated_value_c *symbol) {ERROR; return NULL;} /* should never get called... */
etisserant@0: 
etisserant@0: /*  identifier ':' array_spec_init */
etisserant@0:     void *visit(array_type_declaration_c *symbol) {
etisserant@0:       this->current_type_name = symbol->identifier;
etisserant@0:       return symbol->array_spec_init->accept(*this);
etisserant@0:     }
etisserant@0: 
etisserant@0: /* array_specification [ASSIGN array_initialization} */
etisserant@0: /* array_initialization may be NULL ! */
etisserant@0:     void *visit(array_spec_init_c *symbol) {
etisserant@0:       return symbol->array_specification->accept(*this);
etisserant@0:     }
etisserant@0: 
etisserant@0: /* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */
etisserant@0:     void *visit(array_specification_c *symbol)	{
etisserant@0:       if (NULL == this->current_type_name) ERROR;
etisserant@0:       return (void *)this->current_type_name;
etisserant@0:     }
etisserant@0: 
etisserant@0: /* helper symbol for array_specification */
etisserant@0: /* array_subrange_list ',' subrange */
etisserant@0:     void *visit(array_subrange_list_c *symbol)	{ERROR; return NULL;} /* should never get called... */
etisserant@0: 
etisserant@0: /* array_initialization:  '[' array_initial_elements_list ']' */
etisserant@0: /* helper symbol for array_initialization */
etisserant@0: /* array_initial_elements_list ',' array_initial_elements */
etisserant@0:     void *visit(array_initial_elements_list_c *symbol)	{ERROR; return NULL;} /* should never get called... */
etisserant@0: 
etisserant@0: /* integer '(' [array_initial_element] ')' */
etisserant@0: /* array_initial_element may be NULL ! */
etisserant@0:     void *visit(array_initial_elements_c *symbol)	{ERROR; return NULL;} /* should never get called... */
etisserant@0: 
etisserant@0: /*  structure_type_name ':' structure_specification */
etisserant@0:       /* NOTE: structure_specification will point to either a
etisserant@0:        *       initialized_structure_c
etisserant@0:        *       OR A
etisserant@0:        *       structure_element_declaration_list_c
etisserant@0:        */
etisserant@0:     void *visit(structure_type_declaration_c *symbol)  {
etisserant@0:       this->current_type_name = symbol->structure_type_name;
etisserant@0:       return symbol->structure_specification->accept(*this);
etisserant@0:     }
etisserant@0: 
etisserant@0: /* structure_type_name ASSIGN structure_initialization */
etisserant@0: /* structure_initialization may be NULL ! */
etisserant@0:     void *visit(initialized_structure_c *symbol)	{
etisserant@0:       return symbol->structure_type_name->accept(*this);
etisserant@0:     }
etisserant@0: 
etisserant@0: /* helper symbol for structure_declaration */
etisserant@0: /* structure_declaration:  STRUCT structure_element_declaration_list END_STRUCT */
etisserant@0: /* structure_element_declaration_list structure_element_declaration ';' */
etisserant@0:     void *visit(structure_element_declaration_list_c *symbol)	{
etisserant@0:       if (NULL == this->current_type_name) ERROR;
etisserant@0:       return (void *)this->current_type_name;
etisserant@0:     }
etisserant@0: 
etisserant@0: /*  structure_element_name ':' *_spec_init */
etisserant@0:     void *visit(structure_element_declaration_c *symbol) {ERROR; return NULL;} /* should never get called... */
etisserant@0: 
etisserant@0: /* helper symbol for structure_initialization */
etisserant@0: /* structure_initialization: '(' structure_element_initialization_list ')' */
etisserant@0: /* structure_element_initialization_list ',' structure_element_initialization */
etisserant@0:     void *visit(structure_element_initialization_list_c *symbol) {ERROR; return NULL;} /* should never get called... */
etisserant@0: 
etisserant@0: /*  structure_element_name ASSIGN value */
etisserant@0:     void *visit(structure_element_initialization_c *symbol) {ERROR; return NULL;} /* should never get called... */
etisserant@0: 
etisserant@0: /*  string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */
etisserant@0: /*
etisserant@0: SYM_REF4(string_type_declaration_c,	string_type_name,
etisserant@0: 					elementary_string_type_name,
etisserant@0: 					string_type_declaration_size,
etisserant@0: 					string_type_declaration_init) // may be == NULL!
etisserant@0: */
etisserant@0:     void *visit(string_type_declaration_c *symbol)	{return symbol;}
etisserant@0: };
etisserant@0: 
etisserant@0: 
etisserant@0: 
etisserant@0: